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Reports <code>equals()</code> calls on enum constants.
<p>Such calls can be replaced by an identity comparison (<code>==</code>) because two
  enum constants are equal only when they have the same identity.</p>
<p>A quick-fix is available to change the call to a comparison.</p>
<p><b>Example:</b></p>
<pre><code>
  boolean foo(MyEnum value) {
    return value.equals(MyEnum.FOO);
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  boolean foo(MyEnum value) {
    return value == MyEnum.FOO;
  }
</code></pre>
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